CVE-2026-56159: DHCP Server Service Remote Code Execution Vulnerability
Published Jul 14, 2026
·Updated
DHCP Server Service Remote Code Execution Vulnerability
Other sources
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
— Microsoft
Affected Software
25 affected componentsFixes available
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2022<10.0.20348.5386
10.0.20348.5386
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
Microsoft Windows Server 2022<10.0.20348.5386
Microsoft Windows Server 2025<10.0.26100.33158
Remediation
Event History
Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:09 PM
Data Sourced
via MITRE·05:09 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-56159?
CVE-2026-56159 has a critical severity rating of 9.8.
2
How do I fix CVE-2026-56159?
To fix CVE-2026-56159, apply the latest security updates provided by Microsoft for affected Windows versions.
3
What are the affected software versions for CVE-2026-56159?
CVE-2026-56159 affects Microsoft Windows 10, Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025.
4
What type of vulnerability is CVE-2026-56159?
CVE-2026-56159 is a heap-based buffer overflow vulnerability in the Windows DHCP Server.
5
Can CVE-2026-56159 be exploited remotely?
Yes, CVE-2026-56159 can be exploited remotely by an unauthorized attacker through the network.